Boiler-baffling.



J. E. BELL.

BOILER BAFFLING. APPLICATION mio Nov. s. |915.

1,257,302. Petented Feb.26,191&

2 SHEETS-SHEET l.

i @we f "29T e feemee.

J. E. BELL.

soma ArrLmG.- l

APPLICATION f lLED NOV. 6|'l9l5- Y 1 ,257,302. Pafnented Feb. 26, 1918.

2 SHEETS-SHEET 2.

JOHN E. BELL, 0F BROOKLYN, NEW YORK.

' BOILEB-BAFFLING.

Specification of Letters Patent.

Patented Feb. 26, 1918.

Continuation in part o! application Serial No. 35,788, led June 23, 1915. This application iled November 6, 1915. Serial No. 59,994.

To all lwhom zt may concern.'

Be it known that I, JOHN E. BELL, a citizen of the United States, residing at Brookl in the county of Kings and State of Iw York, have invented a new and useful Improvement in Boiler-Battling, of which the followin is a full, clear, and exact description, re erence being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a sectional side elevation showing my invention applied to a boiler of the general Stirling type, and constructed in accordance with my co-pending application Serial No. 35,788, :(iled June 23, 1915.

Fig. 2 is a partial cross'secticn showing a lower portion of the-front baa.

Fig. 3 is a partial cross section showing the baiiiing at the rear of the bank.

Fig. 4 is a partial longitudinal section of Fi 3.

Figs. 5 and 6 are views similar to Figs. 3 and 4, showing a modification; and

Figs. 7, 8, 9 and 10 are partial cross sections sho'wing modified forms of the baing.

My inventlon relates to baming for boilers and particularly to baing overlying a row of tubes over which `the heated gases How, that is, tubes containing water or steam, or both.

En order to increase the amount of tube surface with which the hot gases may contact and thereby increase the economy and eiiiciency of the boiler, l provide baing which is spaced apart from the tubes with which the baiiling coacts, thus increasing the' heating surfaces and in many cases increasing the area of the pass for the gases. This is of especial importance in that portion of the boiler lying near the combustion chamber where the gases are of larger volume owing to their higher temperature.

1n the drawings I show, in Fig. 1, a boiler of the general Stirling type in which the numerals 2, 3 and 4 represent the upper transverse steam and water drums, and 5 the .lower transverse mud drum. These drums are connected by three banks of tubes 6, 7 and 8, the water spaces of the drums 3 and 4; being preferably connected by water circulators 9, and the three upper drums being preferably connected by steam circulating tubes 10 and 11 leading to the drum 3, from which the steamA is preferably taken od through an outlet 12.

The furnace '13 is preferably shortened up so that the external arch 14 over it is short and can be properly stayed and cooled on its upper side, yif desired. This furnace may, however be extended outwardly to a greater extent il? desired, particularly when burning ard coal. At the rear of the furnace I show a reflectmg br1dge wall 15, and at the front of the front bank of tubes, ll provide a baille coacting with the upper part of the bridge wall to form a contracted mixing throat or outlet 16 through which the flame and gases are led downwardl into the secondary combustion chamber 1;. The upper portion 18 of this front baiie preferably lies on the back of the front row of tubes and the lower part, shown at 19, preferably incloses the tubes and may be of the type shown in Fi 2. ln

this figure, the irregularly shaped b ocks 20 are arranged in pairs with the thinner blocks 21 and are held by the refracto key members 22. rl`he lower portion d? this baiile should encircle those portions of the front row of tubes which lie along the contracted throat outlet of the furnace, to` protect these tubes. These tiles are also preferably recessed to surround the band clam s on the water tubes which support the ba e, to protect these tubes from burning out. The upper rear portion of the bridge wall is preferably. beveled or inclined into substantial parallelism with the baille 19 to form the mixing throat through which the gases dow at relatively high velocity.l

With this boiler, l show threebalies 24, 25 and 26 extending along the back of the three banks of tubes, the baiile 24 extending up from the mud drum and terminating short of the steam and water drum, and preferably provided with a rearwardly extending shelf 28 at its supper part. The bathe 25 extends downwardly from the drum 3 along the rear of the middle bank and terminates short of its lower end; While the baiile 26 covers a portion of the rear bank and holds the gases in this bank as they rise to the up-take 29.

In order to increase the area of flow space for the passage of the gases within the banks and to cause the gases to more thoroughly envelp the rear tubes of the banks, I space the ba ing away from the rear tubes of the banks, as shown in Fig. 1. This is of especial importance in the first pass where gases are given access to portions of the tube surface which otherwise would be more or less covered by the bathing.

In Figs. 3 to 10, inclusive, I show differi ent forms of this spaced apart bang. In

Figs. 3 and 4, the baiiing tiles 30 have longitudinal depending leg portions 31 at one side, which portions rest on alternate tubes, the tiles each having a recessed beaded portion 32 over the leg portion and which is engaged by the thinner grooved portion 33 of the next tile. These tiles also preferably have a tongue and groove engagement at their ends, as shown at 34 in Fig. 1.1.. The tiles may be of a width to span the space between two rows of tubes, as shown, or three or more rows, if desired.

In Figs. 5 and 6, l showfa form similar to that of Figs. 3 and 4, except that each tile has along one edge an upwardly curved and recessed portion 35 having a tongue and groove engagement 36 with the next tile. These tiles preferably overlap 'each other at their ends, as shown at 37 in Fig 6.

In Figs. 7 and 8 I show other modified forms in which the same numerals are used with the letters a and b applied, the overlapping projections being of di'erent shapes, as shown.

In Fig. 9 the tiles take the form of channels 300, the legs 31 itting together and resting on a. water tube.

In Fig. verse arch sha e, arching from one tube of a row to a tu e two or more rows distant therefrom. In this case, the end portions 31l of adjacent arched tiles rest on the same water tube. l

This type o bai'ing is used on the back of each bank and is alsoh preferably used over the water circulators, as shown at 38, so as to allow the gases to envelop these water circulating tubes and thus further increase the heating surfaces;-

It will be understood that this type of baiing may be used in many locations in a boiler. For example, they may be used as arch blocks lying on the Water tubes in a locomotive boiler furnace; and they may overlie water or steam tubes in any part of a boiler.

In the boiler shown, the flame and gases rise from the furnace into the space in front of the front bank, the upper portions of the front row or rows of tubes being heated by radiant heat. They then flow, at highl increased velocity, downwardly throng the throat between the bridge wall and the bank into the secondary combustion chamber, where practically complete combustionwill occur. They then rise among the tubes of the front bank, vsweeping over the tubes,

l0, I show the tiles 30d as of trans- Lacasse including the rear row of the tubes thereof and liow downwardly through the second bank, and up through the third bank. A high velocity is malntained through the front bank and, as heat transfer is more rapid at high temperatures, Y this increased velocity is more marked 1n the front bank.

On account of the mixing of the gases in the throat and the use of the secondary combustion chamber, the gases may be taken directly into the water heating surface. Taking the llame and gases directly into the lower water heating surface would otherwise be objectionable, since the gases would the eliect ofA be chilled in their passage through the front bank and if combustion were not complete before entering that bank its further process would be stopped. The spaced apart baffling at the back of the front bank lves suiiicient area through the front ass, w ich would otherwise be difiicult to o tain.

The secondary combustion chamber back of the reflecting bridge wall is screened rom the more intense radiation of the urnace and I preferably locate a superheater therein. This superheater may be located in the lower part of this combustion chamber as the eddies in the chamber will be sufficient to cause the gases to swee over the surface. On account of the hig temperature of these gases, a relatively small amount of superheating surface is required. Furthermore, on account of this location, the tubes of the superheater may be placed horizontally and supported at intervals throughout their length.

The superheater consists of two or more sets of tubes 39 extending between headers not shown at opposite ends and located in or outside the side walls, the headers Changes may bc made in the form and arrangement of the tiles and ytheir location on the water tubes, steam and water tubes,

or steam tubes of a boiler without departing.

from my invention.

I claim:

. l. A boiler having a row of tubes containmg fluid to be heated, and a spaced-a art baiing coacting with said tubes, said afmg being composed of tiles having projections longitudinal ofthetubes and resting on some of the tubes., and bridging over tainin other intermediate tubes, substantially as described.

2. A boiler havin a row of tubes conuid to be cated, and a s acedapart aie coacting with the row o tubes and composed of refractory tiles, each tile having one side portion overlapping and resting upon the next tile and the other side portion provided with a, projection extending longitudinally of a tube and resting thereon, the tiles bridging some of the intermediate tubes, substantially as described.

3. A boiler having a row of tubes containing uid to be heated, and a continuous baie supported on said row and spaced apart therefrom, the said bale being arranged to cause the gases to ow longitudinally of and around the row and being composed of tiles which rest on some of the tubes and bridge over other intermediate tubes, 20 substantially as described.

4. In a water tube boiler, a bank of tubes, and a continuous baie at the rear. of the bank and spaced apart therefrom, said batie being supported on the row of tubes in front 25 of it and extending from one end of the row the tubes and bridging other tubes of the 30 row, substantially as described.

In testimony whereof I have hereunto set my hand.

`JOHN E. BELL.

Witnesses JOHN Pnnmosu, FRANK PAGE. 

